KR20130009832A - Obtaining method and device for channel information - Google Patents

Abstract

)를 지시하며,

는 8보다 크지 않은 양의 정수이고 해당 단말은

에 근거하여 기지국에 피드백해야 할 프리코딩 매트릭스 지시자(PMI) 정보의 수량을 확정하고 상기 수량의 PMI 정보 및 상기 RI 정보를 기지국에 송신하며 기지국은 상기 수량의 PMI 정보 및 상기 RI 정보에 근거하여 상기 서브밴드의 채널 정보를 취득하는 것을 포함한다. 본 발명은 여러 종류의 피드백 정밀도를 제공할 수 있고 구체적인 수요에 따라 상이한 정밀도의 피드백을 빠르게 배치할 수 있음으로 피드백 오버헤드를 효과적으로 활용하였다.The present invention discloses a method and device for acquiring channel information, and solves a technical problem in which channel information cannot be rapidly fed back according to demand among current technologies. Among them, the acquisition method includes: in one subband, a UE acquires rank indicator (RI) information of a current channel, and among the corresponding RI information, a rank of the current channel (

),

Is a positive integer not greater than 8 and the corresponding terminal is

Determine the quantity of precoding matrix indicator (PMI) information to be fed back to the base station, and transmit the quantity of PMI information and the RI information to the base station, and the base station determines the quantity based on the quantity of PMI information and the RI information. Acquiring channel information of the subband. The present invention effectively utilizes the feedback overhead because it can provide various kinds of feedback precision and can quickly arrange the feedback of different precision according to the specific demand.

Description

OBTAINING METHOD AND DEVICE FOR CHANNEL INFORMATION}

The present invention relates to a communication area, and more particularly, to a method and apparatus for acquiring a kind of channel information.

Among the wireless communication systems, the transmitting end and the receiving end take a spatial multiplexing scheme and acquire a higher speed using several antennas. A technique that is enhanced compared to the general spatial multiplexing method is that the receiver feeds back channel information toward the transmitter and the transmitter uses transmission precoding techniques based on the acquired channel information, which can greatly improve transmission performance. In single-user multi-input multi-output (SU-MIMO, MIMO indicates multi-input multi-output multi-input multi-output), precoding is performed using direct channel specific vector information and multi-user MIMO (MU- In MIMO, accurate channel information should be compared.

In the 3GPP Long Term Evolution (LTE) scheme, the feedback of channel information mainly uses the feedback method of a single codebook, which is relatively simple, and the performance of the transmission precoding technique of MIMO depends more and more on the accuracy of the codebook feedback therein. .

Here, the basic principle of the numerical feedback of channel information based on the codebook is briefly described as follows.

bps/Hz라고 가정하면 사용 가능한 코드워드의 수량은

개이다. 채널 매트릭스의 고유 벡터공간은 수치화를 거쳐 코드북 공간

을 구성한다. 송신단과 수신단이 공동으로 저장하거나 또는 실시간으로 본 코드북

(송신단과 수신단이 동일)을 생성한다. 매번 채널에 대해 H를 실현하고 수신단은 일정한 준칙에 근거하여 코드북 공간

중에서 채널이 H를 실현하는데 제일 적합한 하나의 코드워드

를 선택하고 또한 해당 코드워드

의 순번

(코드워드 순번)를 송신단에 피드백한다. 여기에서 코드워드 순번을 코드북 프리코딩 매트릭스 지시자(Precoding Matrix Indicator, PMI라고 약칭함)라고 칭한다. 송신단은 본 순번

에 근거하여 상응한 프리코딩 코드워드

를 검색하고, 또한 상응한 채널 정보도 취득하며

는 채널의 고유 벡터정보를 표시한다. The capacity of the limited feedback channel

Assuming bps / Hz, the number of available codewords is

Dog. The unique vector space of the channel matrix is numerically coded

Configure Codebooks stored jointly by the sender and the receiver or viewed in real time

(The transmitter and receiver are the same). Each time realizes H for the channel and the receiver uses codebook space based on certain rules.

One codeword best suited for channel H realization

Select the codeword

Sequence number

(Codeword sequence number) is fed back to the transmitting end. The codeword sequence number is referred to herein as a codebook precoding matrix indicator (abbreviated as PMI). The sender's number

The corresponding precoding codeword based on

, And also get corresponding channel information.

Represents the eigenvector information of the channel.

은 여러 개의 Rank에 대응하는 코드북으로 더한층 구분할수 있고 각Rank하에 여러 개의 코드워드를 대응하여 해당 Rank하 채널의 고유 벡터로 구성된 프리코딩 매트릭스를 수치화한다. 채널의 Rank와 비 제로 고유 벡터의 수량은 동일하므로 일반적으로 Rank가 N일 때 코드워드는 모두 N열이 있다. 그러므로 코드북 공간

은 Rank의 상이함에 따라 여러 개의 서브 코드북으로 구분할 수 있고 아래 표 1에 제시한 바와 같다.Codebook space

Can be further divided into codebooks corresponding to several ranks, and a number of codewords are mapped under each rank to digitize a precoding matrix composed of the unique vectors of channels under the rank. Since the rank of a channel and the number of non-zero eigenvectors are the same, when a rank is N, all codewords have N columns. Therefore codebook space

Can be divided into several sub-codebooks according to different ranks, as shown in Table 1 below.

[Table 1] Codebooks are divided into several subcodebooks according to rank.

Among the codewords stored when Rank> 1, all of the codewords should be in matrix format. Among them, the codebook in the LTE protocol is a feedback method of the codebook digitization, and the LTE downlink 4 transmission antenna codebook is shown in Table 2, The meaning of the precoding codebook and the channel information digitization codebook in the same is the same. In order to unify the following documents, vectors can also be regarded as one matrix having a dimension of 1.

[Table 2] LTE downlink 4 transmit antenna codebook description

이고, I는 단위 매트릭스이고,

는 매트릭스

의 제

열 벡터를 표시한다.

는 매트릭스

의 제

열이 구성한 매트릭스를 표시하고,

은

의 공액전치행렬을 표시하며, 그 중 n은 순번을 표시하고 수치는 0~15 이내이다.among them,

I is the unit matrix,

The matrix

Of

Display the column vector.

The matrix

Of

Display the matrix organized by columns,

silver

The conjugated transpose matrix of, where n represents the sequence number and the number is within 0 ~ 15.

As communication technology advances, there is a higher demand for spectral efficiency among the advanced LTE-Advanced, so antennas have increased to eight, and accordingly, eight transmit antenna codebook feedbacks are designed to digitize feedback of channel information. It should be done.

In the LTE standard, the minimum feedback unit of channel information is a subband, one subband is composed of several resource blocks (RBs), and each RB is composed of several resource elements (REs). . RE is the smallest unit of time frequency resources in LTE and continues to use the resource representation method of LTE in LTE-A.

로 표시됨) 등의 각종 함수관계로 표시할 수 있다:

또는 WPMI1×WPMI2，WPMI2

WPMI1 등 각종 함수관계.In the current technology, the technical idea is relatively largely different from the previous method of single codebook feedback, and the UE feeds back one piece of first precoding matrix indicator (PMI1) information, and the base station is in codebook C1 based on PMI1. Searching for the corresponding codeword WPMI1 and the UE also feeds back one or more other precoding matrix indicator information (PMI1), and PMI2 to PMIn (first precoding matrix indicator information, ..., respectively, n th precoding matrix). Indicator information), and the base station searches for the corresponding codewords WPMI2 to WPMIn from the corresponding codebooks, and forms a matrix using the function relationship F (WPMI1, WPMI2, ..., WPMIn) to form sub-channel channel information. It can be described as displaying. Taking two PMIs as an example, the channel information is the product or Kronecker product (operator is

Can be represented by various functional relationships such as:

Or WPMI1 × WPMI2, WPMI2

Various functional relationships such as WPMI1.

The feedback of multiple PMIs can arrange feedback cycles of different kinds of PMIs to effectively use feedback resources and improve feedback accuracy effectively, without having to design a single codebook with a large number of codewords. Reduces the complexity of the design of the codebook.

However, the problem with the existing technology is that this feedback method should be applied to all contexts, and the performance improvement brought by WPMI2 changed through feedback PMI2 under relatively high rank context is limited. However, when the feedback amount of PMI2 is relatively large and high rank, it is a single user MIMO (SU-MIMO), and the demand for precision of feedback is relatively low.

The present invention provides a method and apparatus for acquiring channel information and solves a technical problem in that channel information cannot be quickly fed back according to demand among existing technologies.

In order to solve the above technical problem, the present invention provides a method for acquiring channel information as follows.

)를 지시하며,

는 8보다 크지 않은 양의 정수이고;For one subband, the UE acquires rank indicator (RI) information of the current channel, and among the corresponding RI information, the rank of the current channel (

),

Is a positive integer not greater than 8;

에 근거하여 기지국에 피드백해야 할 프리코딩 매트릭스 지시자(PMI) 정보의 수량을 확정하고, 상기 수량의 PMI 정보 및 상기 RI 정보를 기지국에 송신하며;The terminal

Determine the quantity of precoding matrix indicator (PMI) information to be fed back to the base station, and transmit the quantity of PMI information and the RI information to the base station;

The base station includes acquiring channel information of the subband based on the quantity of PMI information and the RI information.

에 근거하여 기지국에 피드백하여야 할 PMI 정보의 수량을 확정하는 단계는:

≥N0일 때 단말은 해당 PMI 정보의 수량을 m으로 확정하고

＜N0일 때 해당 단말은 해당 PMI 정보의 수량을 m+1로 확정하며 그 중 N0은 0보다 크고 8보다 작거나 같은 정수이고 m는 정수이며 단말의 피드백 정밀도의 등급에 근거하여 확정하는 것을 포함한다. 바람직하게는 단말은

에 근거하여 기지국에 피드백해야 할 PMI 정보의 수량을 확정하는 절차는 또한:

＜N1일 때 단말이 해당 PMI 정보의 수량을 m+2로 확정하고 그 중 N1을 N0보다 작고 0보다 큰 정수인 것도 포함한다.Preferably the terminal

The step of determining the quantity of PMI information to be fed back to the base station based on:

When ≥N0, the terminal determines the quantity of the corresponding PMI information to m.

When <N0, the terminal determines the quantity of the corresponding PMI information as m + 1, wherein N0 is an integer greater than 0 and less than or equal to 8, m is an integer, and is determined based on the level of feedback precision of the terminal. do. Preferably the terminal

The procedure for determining the quantity of PMI information to be fed back to the base station based on:

When <N1, the terminal determines the quantity of the corresponding PMI information as m + 2, and includes N1 as an integer smaller than N0 and larger than 0.

)에 따라 상이한 약속치이고 그 중

는 RI 정보가 표시한 채널의 랭크을 표시한다.Preferably, the corresponding PMI information includes at least first precoding matrix indicator (PMI1) information. Preferably, the base station acquires the channel information of the subbands based on the PMI information and the RI information: when the terminal determines the quantity of the corresponding PMI information to 1, the base station based on the PMI information and the RI information, The codeword W1 is searched in the codebook, and the channel information of the subband is obtained based on the codeword W1 and the functions F (W1, W2, ..., Wn) of the total n-1 matrices, or the base station obtains the codeword. W1 is represented as channel information of the subband, wherein n-1 matrices are promise values, n is an integer, or the base station directly acquires channel information of the subband based on the codeword W1. When the quantity of the corresponding PMI information is r, the base station searches for the codeword W1 in the first codebook based on the PMI1 information and the RI information, and also, among the codebooks corresponding to the r-1 PMI information other than the PMI1 information, other r-1. Dog Retrieves the matrix and acquires channel information of the subband based on the codeword W1 and the function F (W1, W2, ..., Wn) of n-1 matrices including the corresponding m-1 matrices. Of the n-1 matrices, other nr matrices other than the corresponding r-1 matrices are promise values, or the base station is based on the codeword W1 and the function f (W1, W2, ..., Wr) of the corresponding r-1 matrices. Channel information of a subband is obtained, where r is an integer greater than or equal to two. Preferably the promise is a fixed or unchanging vector or matrix or rank of the current channel (

) Is a different promise

Denotes the rank of the channel indicated by the RI information.

W1을 포함하고 r=3일 때 함수 F(W1, W2, W3)는 (W3’*W3)×W1×W2 또는 W2

(W3’×W3×W1)를 포함하며, 그 중 W3’은 W3의 공액전치행렬을 표시한다.Preferably, when r = 2, the function F (W1, W2) is W1 × W2 or W2

Functions F (W1, W2, W3), including W1 and r = 3, are (W3 '* W3) × W1 × W2 or W2

(W3 'x W3 x W1), where W3' denotes the conjugate transpose matrix of W3.

The present invention also provides another method of arranging channel information, among which:

The base station transmits batch signaling and indicates a quantity of precoding matrix indicator (PMI) information to be fed back by the terminal through corresponding batch signaling;

The terminal determines the PMI information to be fed back to the base station based on the corresponding batch signaling, and feeds back the determined PMI information and rank indicator (RI) information of the current channel to the base station;

The base station includes acquiring channel information of the subband based on the corresponding PMI information and the RI information.

Preferably, the method further includes the base station determining the quantity of PMI information to be fed back by the terminal based on the rank or polarization configuration information of the channel fed back by the terminal.

Preferably, the base station transmits the batch signaling on the high-channel channel radio resource control (RRC) signaling or the physical downlink control channel (PDCCH) to the corresponding terminal.

The present invention also provides an apparatus for obtaining a kind of channel information, among which:

A receiving module, configured to receive precoding matrix indicator (PMI) information and rank indicator (RI) information of a current channel transmitted by the terminal;

An acquisition module installed to acquire channel information of a subband based on the received PMI information and RI information;

)에 근거하여 확정하고, 해당 정보 중에서

를 지시하고,

는 8보다 크지 않은 양의 정수인 것을 포함한다.Among them, the quantity of PMI information is determined by the rank of the current channel in the terminal (

), And from that information

To indicate,

Includes a positive integer not greater than eight.

Preferably, the PMI information includes at least the first precoding matrix indicator PMI1 information and the acquisition module is arranged to acquire channel information of the subband in the following manner. When the terminal determines the quantity of the PMI information to 1, the corresponding PMI1 information and the corresponding RI information retrieve the codeword W1 from the first codebook, and the function F (W1, W2,... ..., or acquire the channel information of the subband based on Wn), or display the corresponding codeword W1 as the channel information of the subband, wherein n-1 matrices are promise values, n is an integer, or Subband channel information is obtained based on the codeword W1.

Preferably, the PMI information includes at least the first precoding matrix indicator PMI1 information and the acquisition module is arranged to acquire channel information of the subband in the following manner. When the terminal determines the quantity of the PMI information to r, the codeword W1 is searched in the first codebook based on the corresponding PMI1 information and the corresponding RI information, and among the codebooks corresponding to other r-1 PMI information other than the codeword W1. Retrieves r-1 matrices corresponding to other r-1 PMI information, and functions F (W1, W2, ..., Wn) of n-1 matrices including the corresponding codeword W1 and the corresponding r-1 matrices. Acquire channel information of subbands based on the subbands, and among the n-1 matrices, nr matrices other than the r-1 matrices are promise values, or are functions of the codeword W1 and the corresponding r-1 matrices. Subband channel information is obtained based on f (W1, W2, ..., Wn), where r is an integer greater than or equal to two.

In order to solve the above technical problem, the present invention also provides a device for arranging a kind of channel information, among which:

Transmission module installed to transmit the batch signaling and indicate the quantity of precoding matrix indicator (PMI) information to be fed back to the terminal through the corresponding batch signaling to determine the PMI information to be fed back based on the corresponding batch signaling ;

A receiving module, configured to receive PMI information transmitted by the terminal and rank indicator (RI) information of the current channel;

And an acquisition module installed to acquire channel information of the subband based on the PMI information and the RI information received by the reception module.

Preferably, the transmitting module is also installed to determine the quantity of the corresponding PMI information to be fed back by the terminal based on the rank or polarization configuration information of the channel fed back by the terminal.

Preferably, the transmission module is installed to transmit the batch signaling on the high-channel RRC signaling or the physical downlink control channel (PDCCH) to the terminal.

In contrast to the current technology (prior art), the technical scheme of the present invention can provide various kinds of feedback precisions by providing a method and an apparatus for acquiring channel information under eight antenna types, and differ according to specific demands. Because feedback can be quickly placed, the feedback overhead is effectively utilized.

Other features and advantages of the invention will be set forth in the description that follows, and some of the content can be very clearly understood or practiced by the invention. The objects and other advantages of the present invention can be realized and obtained through structures particularly pointed out in the written description, the claims and the accompanying drawings.

Compared with the prior art, the feedback overhead can be effectively utilized because it can provide various kinds of feedback precision and quickly arrange different kinds of feedback according to specific demands.

The accompanying drawings are used to provide a further understanding of the invention and also form part of the description and are used to interpret the invention in conjunction with the embodiments of the invention and are not limiting of the invention. Among the attached drawings:
1 is a flow explanatory diagram of Embodiment 1 of the present invention;
2 is a flow explanatory diagram of a second embodiment of the present invention;
3 is a flow explanatory diagram of a fifth embodiment of the present invention;
4 is a flow explanatory diagram of a sixth embodiment of the present invention;

Hereinafter will be described in detail with respect to the embodiment of the present invention in combination with the accompanying drawings and embodiments. In this way, the present invention is applied to the technical means to solve the technical problems, and to fully understand the realization process of achieving the technical effect and to implement the present invention based on this.

If not conflicting, the embodiments of the present invention and the various features in the embodiments can be combined with each other and all fall within the protection scope of the present invention. In addition, the steps presented by the flowchart in the accompanying drawings may be executed in a computer system in which the computer may execute the instructions and may differ from the steps presented or described herein in some cases, although the logical rank may be presented in the flowchart. Can be executed according to rank.

The feedback of the channel information described in the existing technology is not fast. Besides, the UE and the evolutionary base station (eNodeB, also referred to as base station) are both double polarized (the UE and the evolution base station are dual polarized antennas). (dual polarization antenna), we found that even if we feed back PMI2, we can get very little gain. In addition, under some other circumstances, not all of them have to feed back using multiple PMIs, and if the demand for feedback precision is relatively low, it is a waste of cost overhead without reason if there is always multiple PMI feedbacks.

, 프리코딩 매트릭스 지시자(PMI1) 정보와 프리코딩 매트릭스 지시자(PMI2 ~ PMIn) 정보 중의 적어도 하나를 피드백한다. UE는

또는

및 기타 정보에 근거하여 피드백해야 할 PMI를 판단한다.The UE indicates rank indicator (RI) information of the feedback channel,

At least one of the precoding matrix indicator PMI1 information and the precoding matrix indicator PMI2 to PMIn information is fed back. The UE

or

And PMI to be fed back based on other information.

When the UE determines to feed back one PMI, the UE feeds back PMI1, and the base station searches for one codeword W1 in the first codebook based on RI and PMI1, and determines that W2 to Wn are promise values. The base station acquires subband channel information based on F (W1, W2, ..., Wn), or directly displays channel information using W1.

When it is determined that the UE feeds back r PMIs, the UE feeds back several PMIs including PMI1 and the base station searches for one codeword W1 among the first codebooks based on the RI and PMI1. Further, based on PMI2 to PMIr, the corresponding matrix W2 to Wr is retrieved from the corresponding codebook. Wr + 1 to Wn are promise values. The base station acquires the channel information of the subband based on F (W1, W2, ..., Wn). Or the base station displays the channel information only in accordance with f (W1, W2, ..., Wr). n is an integer not less than 2, r is less than or equal to n and at the same time greater than or equal to 1.

The promise value may be a fixed or unchanging vector or matrix, preferably a unitary matrix.

에 근거하여 상이한 약속치일 수도 있다.The promise is based on RI

It may be a different promise based on.

에 근거하여 판단하고,

가 조건

<N0을 만족할 때 오직 m개의 PMI를 피드백하고 만족하지 않을 때에는 m+1개의 PMI를 피드백하며 m의 값은 기타 정보에 따라 결정된다. N0은 2, 3, 4 또는 5일 수 있다.The base station

To judge based on

Autumn conditions

Only m PMIs are fed back when <N0 is satisfied; m + 1 PMIs are fed back when not satisfied, and the value of m is determined according to other information. NO may be 2, 3, 4 or 5.

가 조건

>=N0을 만족할 때 오직 m개의 PMI를 피드백하고, N1<＝

<N0일 때 m＋1개의 PMI를 피드백하며,

<N1일 때 m＋2개의 PMI를 피드백한다.or

Autumn conditions

Only m PMIs are fed back when> = N0, where N1 <=

When <N0, feedback m + 1 PMI,

When <N1, m + 2 PMIs are fed back.

The m value is determined by other information and is determined by, for example, the degree of feedback precision of the UE.

Or use the following method.

In subband channel information, the base station transmits batch signaling so that the precoding matrix indicator information to be fed back to the UE is used to arrange r of PMI1 to PMMI: PMI1 to PMIr. The UE feeds back r codebook indices based on the indication of the batch signaling, where r is greater than or equal to 1 and simultaneously less than or equal to n.

When the arrangement is to feed back r PMIs, the UE feeds back at least PMI and RI information, and the base station searches for one codeword W1 in the first codebook based on the RI and PMI1. If r is not equal to 1, the UE should also feed back PMI2 to PMIr, and the base station searches for the corresponding matrix W2 to Wr among the corresponding codebooks based on PMI2 to PMIr.

Wr + 1 to Wn are promise values, and the base station acquires subband channel information based on F (W1, W2, ..., Wn).

or,

The base station acquires channel information based on f (W1, W2, ..., Wr). When r is 1, W1 displays channel information directly.

Furthermore, the promise may be a fixed or unchanging vector or matrix;

Furthermore, the promise may also be a different promise based on different RIs.

Preferably, the batch signaling transmitted by the base station carries in the downlink control channel PDCCH;

Preferably, the batch signaling reached by the base station carries on high channel RRC signaling.

Preferably, the base station arranges the r value based on the RI information.

Preferably, the base station arranges the r value based on the polarization information.

)를 취득하고

에 근거하여 기지국에 피드백해야 할 PMI의 개수를 확정한다. In the technique of the present invention, the UE acquires the rank indicator (RI) information of the current channel in the channel information of the subband, and selects the rank (RI)

)

Based on the number of PMI to be fed back to the base station is determined.

가 N0보다 크거나 같을 때 UE는 기지국에 m개의 프리코딩 매트릭스 지시자(PMI) 정보와 해당 RI를 피드백하고

가 N0보다 작을 때 UE는 기지국에 m+1개의 PMI 정보와 해당 RI 정보를 피드백하며 그 중 m는 UE가 피드백하는 정밀도의 등급 등 정보에 의해 확정되고 N0은 0보다 크고 동시에 8보다 작거나 같은 정수이고 예를 들면 2, 3, 4, 5등 값을 취할 수 있다.

Is greater than or equal to N0, the UE feeds back m precoding matrix indicator (PMI) information and the corresponding RI to the base station.

Is less than N0, the UE feeds back m + 1 PMI information and corresponding RI information to the base station, of which m is determined by information such as the degree of precision fed back by the UE, where N0 is greater than 0 and less than or equal to 8 at the same time. It is an integer and can take on values such as 2, 3, 4, 5, and the like.

가 조건

<N0를 만족할 때:Of the technical solutions of the present invention

Autumn conditions

When <N0 is satisfied:

가 조건 N1≤

<N0를 만족할 때, UE는 기지국에 m+1개의 PMI 정보와 해당 RI 정보를 피드백하고, 이 때 N1은 0보다 크고 동시에 N0보다 작은 정수이며;

N1≤

When <N0 is satisfied, the UE feeds back m + 1 PMI information and corresponding RI information to the base station, where N1 is an integer greater than 0 and simultaneously less than N0;

가 조건

<N1를 만족할 때, UE는 기지국에 m＋2개의 PMI 정보와 해당 RI 정보를 피드백하는 것을 포함한다.

Autumn conditions

When <N1 is satisfied, the UE includes feeding back m + 2 PMI information and corresponding RI information to the base station.

When the UE determines to feed back one PMI, the UE feeds back the first precoding matrix indicator (PMI1) information, and the base station refers to one codeword W1 (or matrix W1) among the first codebooks based on the RI and the PMI1. ), The remaining matrices W2 to Wn are promise values, of which n is an integer not less than two. The base station has all n codewords W1, W2,... And channel information of the subbands is obtained based on the function F (W1, W2, ..., Wn) of Wn, or channel information is directly displayed using W1.

When determining that the UE feeds back r PMIs, the UE feeds back multiple PMIs including PMI1, and the base station searches for one codeword W1 in the first codebook based on RI and PMI1, and also transmits to PMI2 to PMIr. Based on the corresponding codebook, the corresponding matrix W2 to Wr (r is smaller than or equal to n and at the same time greater than or equal to 2) is searched for, and the remaining Wr + 1 to Wn are promise values. The base station selects all n codewords W1, W2,... Obtain channel information of the subbands based on the functions F, W1, W2, ..., Wn of, and Wn, or only r codewords W1, W2, ... ... The channel information of the subband is obtained based on the function f (W1, W2, ..., Wr) of Wr.

The promise value may be a fixed or unchanging vector or matrix, preferably a unitary matrix.

에 근거하여 상이한 약속치일 수도 있다.The promise

It may be a different promise based on.

In another channel scheme of the present invention, in the subband channel information, the base station transmits batch signaling, and the batch signaling is used to arrange x pieces of precoding matrix indicator information PMI1 to PMIn to be fed back by the UE. PMI1 to PMIx, where x is greater than or equal to 1, at the same time less than or equal to n, and n is an integer not less than 2. After receiving the corresponding batch signaling, the UE feeds back the corresponding PMI1 to PMIx total x precoding matrix indicator information and the rank channel (RI) information of the current channel based on the indication of the corresponding batch signaling.

When the UE indicates that the x PMI information should be fed back during the batch signaling, the x PMI information feeds back at least a first precoding matrix indicator (PMI). In the corresponding PMI information, the base station searches for one codeword W1 in the first codebook based on the RI and the PMI1. If x is not equal to 1, then the UE is also informed of the second precoding matrix indicator (PMI2) information, the third precoding matrix indicator (PMI3) information,. ... In addition, the x th precoding matrix indicator (PMIx) information should be fed back and the base station searches for corresponding matrices W2 to Wx among corresponding codebooks based on the corresponding PMI2 to PMIx. Wx + 1 to Wn are promise values.

The base station is provided with corresponding W1, W2,... ... Obtains subband channel information based on a function F (W1, W2, ..., Wn) of the total n pieces of PMI information;

or,

The base station is provided with corresponding W1, W2,... ... , Wx Subchannel channel information is obtained based on a function f (W1, W2, ..., Wx) of the total x PMI information.

When x is 1, channel information of a subband may be directly indicated by W1.

에 근거하여 상이한 약속치인 것이다.The promise value may be a fixed or unchanging vector or matrix and preferably the promise value

Based on different promises.

Preferably, the deployment signaling transmitted by the base station may carry on the downlink control channel (PDCCH) and on the high channel radio resource control (RRC) signaling.

Preferably, the base station determines the quantity x based on the RI information and also arranges the quantity x based on the polarization information.

Example  One

As a kind of channel information acquisition method, as shown in FIG. 1, the following steps are mainly included.

)과 N0의 크기 관계를 판단하고 만약

≥N0를 만족하면 단계 S120로 이동하고 만약 만족하지 않으면 (즉

<N0) 단계 S140로 이동한다.In step S110, the UE acquires channel information through pilot frequency and channel prediction, and also, based on the rank indicator (RI) information of the current channel, the rank of the current channel (

) And the magnitude relationship between N0

If ≥N0 is satisfied, go to step S120 and if not satisfied (i.e.

<N0) Step S140 is reached.

≥N0 정황이 SU-MIMO(단일 유저 MIMO)의 정황에 더욱 많이 적용되고 피드백 정밀도에 대한 요구가 높지 않고 UE는 한 개의 PMI를 선택하여 채널 정보의 피드백을 진행한다.In step S120, the UE feeds back one PMI value and feeds back a PMI and an RI to the eNodeB.

≥N0 context is more applied to the context of SU-MIMO (single user MIMO) and the demand for feedback precision is not high and the UE selects one PMI to proceed with feedback of channel information.

In step S130, the base station receives the PMI1 and the RI, searches for a corresponding codeword W1 in the promised codebook based on the PMI1 and the RI, and ends the codeword W1 as the channel information.

<N0 정황은 MU-MIMO(멀티 유저 MIMO)의 정황에 더욱 많이 적용되며 피드백 정밀도에 대한 요구가 비교적 높고 UE는 2개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.In step S140, the UE feeds back two PMI values and feeds back PMI1, PMI2 and RI to the base station,

The <N0 context is more applicable to the context of MU-MIMO (multi-user MIMO) and the demand for feedback precision is relatively high and the UE can select two PMIs to feed back channel information.

W1를 채널 정보로 하고 종료한다.In step S150, the base station receives PMI1, PMI2, and RI, searches for corresponding W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2, and RI, and also W1 × W2 or W2 based on the promised function.

End with W1 as channel information.

Example  2

A kind of channel information acquisition method is shown in FIG. 2 and mainly includes the following steps.

)와 N0의 크기 관계를 판단하고 만약

≥N0를 만족하면 단계 S220으로 이동하고, 만약 만족하지 않으면(즉

<N0) 단계 S240으로 이동하며 바람직하게는 N0=5이다.In step S210, the UE acquires channel information through pilot frequency and channel prediction, and also, based on the rank indicator (RI) information of the current channel, the rank of the current channel (

) And the magnitude relationship between N0

If ≥N0 is satisfied, go to step S220, if not satisfied (i.e.

<N0) Move to step S240, and preferably N0 = 5.

≥N0 정황이 SU-MIMO(단일 유저 MIMO)의 정황에 더욱 많이 적용되고 피드백 정밀도에 대한 요구가 높지 않고 UE는 한 개의 PMI를 선택하여 채널 정보의 피드백을 진행한다.Step S220, the UE feeds back one PMI value and feeds back the PMI and RI to the base station (eNodeB),

≥N0 context is more applied to the context of SU-MIMO (single user MIMO) and the demand for feedback precision is not high and the UE selects one PMI to proceed with feedback of channel information.

In step S230, after receiving the PMI1 and the RI, the base station searches for the corresponding codeword W1 among the promised codebooks based on the PMI1 and the RI and ends.

와 N1의 크기 관계를 판단하고, 만약 N1≤

<N0를 만족하면 단계 S250으로 이동하고, 만족하지 않으면 단계 S270으로 이동하며, 그 중 바람직하게는 N1=3(다른 실시예 중에서 N1=2)이다.Step S240, furthermore, the UE

Judging the magnitude relationship between N1 and N1≤

If <N0 is satisfied, the process moves to step S250, and if it is not satisfied, the process moves to step S270, of which N1 = 3 (N1 = 2 in other embodiments).

<N0 정황은 MU-MIMO(멀티 유저 MIMO)의 정황에 더욱 많이 적용되며 피드백 정밀도에 대한 요구가 비교적 높고 UE는 2개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.Step S250, the UE feeds back two PMI values and feeds back PMI1, PMI2 and RI to the base station,

The <N0 context is more applicable to the context of MU-MIMO (multi-user MIMO) and the demand for feedback precision is relatively high and the UE can select two PMIs to feed back channel information.

W1를 채널 정보로 하고 종료한다.In step S260, the base station receives PMI1, PMI2 and RI, searches for corresponding W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2 and RI, and also W1 × W2 or W2 based on the promised function.

End with W1 as the channel information.

<N1에 대응하고 이때 피드백 정밀도에 대한 요구가 비교적 높을 뿐만 아니라 N1 ≤

<N0의 정황에 대비하여 채널에 관련된 정보를 이용할 수도 있고, 더 나아가서는 피드백 정밀도를 향상시킬 수 있으므로 3개의 PMI가 필요하고 UE는 3개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.Step S270, the UE feeds back the PMI1, PMI2, PMI3 (channel related information) and RI to the base station,

Corresponding to <N1, where the demand for feedback precision is relatively high, and N1 <

Since the information related to the channel may be used in preparation for the situation of <N0, and further, the feedback precision may be improved, three PMIs are required, and the UE may select three PMIs to feed back channel information.

(W3’×W3×W1)를 채널 정보로 하고 종료하며 그 중 W3’은 W3’의 공액전치행렬을 표시한다.In step S280, the base station receives PMI1, PMI2, PMI3 and RI, searches for corresponding W1, W2 and W3 among the promised codebooks based on the corresponding PMI1, PMI2, PMI3 and RI, and also based on the promised function (W3 '* W3) × W1 × W2 or W2

Ends with (W3 '× W3 × W1) as the channel information, where W3' indicates the conjugate transpose matrix of W3 '.

Example  3

As a kind of channel information acquisition method, some steps are the same as those in Embodiment 1 described above, and others are mainly distinguished from Embodiments:

<N0일 때 기지국은 PMI1, PMI2와 RI를 수신한 후, 해당 PMI1, PMI2와 RI에 근거하여 약속한 코드북 중에서 대응하는 코드워드 W1과 W2를 검색하고 또한 W1×W2×G에 근거하여 채널 정보를 취득하고 그 중 G는 하나의 고정 매트릭스(예를 들면 단위 매트릭스)이다.

When <N0, the base station receives PMI1, PMI2 and RI, then searches for corresponding codewords W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2 and RI, and also based on channel information based on W1 × W2 × G. Where G is one fixed matrix (e.g. unit matrix).

<N0의 정황에도 적용할 수 있고, 즉 본 발명의 기타 어느 한 실시예에 적응할 수 있고 그의 일부 단계는 앞에서 서술한 실시예 2와 동일하며 그와 실시예 2와 주로 구별되는 부분은:The technical solution of this embodiment is described in that N1≤

Applicable to the context of <N0, i.e., adaptable to any other embodiment of the present invention, the steps of which are the same as in Example 2 described above and which are mainly distinguished from Example 2:

<N0일 때 기지국은 PMI1, PMI2와 RI를 수신한 후 해당 PMI1, PMI2와 RI에 근거하여 약속한 코드북 중에서 대응하는 코드워드 W1과 W2를 검색하고, 또한 W1×W2×G에 근거하여 채널 정보를 취득하고, 그 중 G는 하나의 고정 매트릭스(예를 들면 단위 매트릭스)이다.N1≤

When <N0, the base station receives the PMI1, PMI2 and RI, and then searches for the corresponding codewords W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2 and RI, and also based on the channel information based on W1 × W2 × G. Where G is one fixed matrix (e.g., a unitary matrix).

Example  4

As a kind of channel information acquisition method, some of the steps are the same as those of the first embodiment described above and mainly distinguished from the other embodiments of the present invention:

<N0일 때 기지국은 PMI1, PMI2와 RI를 수신한 후 해당 PMI1, PMI2와 RI에 근거하여 약속한 코드북 중에서 대응하는 코드워드 W1과 W2를 검색하고, 또한 W1×W2×G에 근거하여 채널 정보를 취득하며, 그 중 G는 RI값에 근거하여 확정하는 매트릭스이고,

＝1일 때 G는

;

＝2일 때 G는

;

＝3일 때 G는

이며, 이와 같이 유추한다.

When <N0, the base station receives the PMI1, PMI2 and RI, and then searches for the corresponding codewords W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2 and RI, and also based on the channel information based on W1 × W2 × G. Where G is a matrix determined based on the RI value,

G = 1

;

G = 2

;

= 3 when G is

And inferred like this.

The technical solution of this embodiment can be applied to the context of N1 <= RI <N0 in the above-described embodiments, that is, can be adapted to any other embodiment of the present invention, and some steps thereof are the same as in the above-described embodiment 2 Other parts mainly distinguished from Example 2 are:

<N0일 때 기지국은 PMI1, PMI2와 RI를 수신한 후 해당 PMI1, PMI2와 RI에 근거하여 약속한 코드북 중에서 대응하는 코드워드 W1과 W2를 검색하고 또한 W1×W2×G에 근거하여 채널 정보를 취득하며, 그 중 G는 RI값에 근거하여 확정하는 매트릭스이고, 만약

＝1일 때 G는

;

＝2일 때 G는

;

＝3일 때 G는

이고, 이와 같이 유추한다.N1 ≤

When <N0, the base station receives PMI1, PMI2, and RI, searches for corresponding codewords W1 and W2 among the promised codebooks based on the corresponding PMI1, PMI2, and RI, and searches channel information based on W1 × W2 × G. Where G is a matrix that is determined based on the RI value,

G = 1

;

G = 2

;

= 3 when G is

And inferred like this.

Example  5

As a kind of channel information acquisition method, as shown in FIG. 3, the method mainly includes the following steps.

In step S310, the UE obtains channel information through pilot frequency and channel prediction, and also feeds back rank indicator (RI) information of the current channel to the base station (eNodeB).

In step S320, the base station determines the quantity x of precoding matrix indicator information to be fed back by the UE based on the corresponding RI fed back by the UE and transmits the quantity x to the UE through one batch signaling, wherein x = 1 days Go to step S330, and if x = 1, go to step S350.

)를 취득하고,

≥N0일 때 해당 기지국은 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x가 1과 같음을 확정하고 아니면 기지국은 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x가 2와 같음을 확정한다.In one specific application, a base station can determine the rank of the current channel based on its RI.

),

When ≥N0, the base station determines that the quantity x of precoding matrix indicator information to be fed back by the UE is equal to 1, or the base station determines that the quantity x of precoding matrix indicator information to be fed back by the UE is equal to 2. .

≥N0 정황은 더욱 많이는 SU-MIMO(단일 유저 MIMO)의 정황에 적용되고 피드백 정밀도에 대한 요구가 높지 않고 UE는 한 개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.

≥N0 context is more applied to the context of SU-MIMO (single user MIMO) and the demand for feedback precision is not high and the UE can select one PMI to feed back channel information.

<N0 정황은 더욱 많이는 MU-MIMO(멀티 유저 MIMO)의 정황에 적용되고 피드백 정밀도에 대한 요구가 비교적 높고 UE는 2개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.

The <N0 context is more applicable to the context of MU-MIMO (multi-user MIMO) and the demand for feedback precision is relatively high and the UE can select two PMIs to feed back channel information.

In step S330, after receiving the corresponding batch signaling, the UE acquires that the quantity x is equal to 1 and feeds back the PMI1 and the RI to the base station.

In step S340, after receiving the PMI1 and the RI, the base station searches for the corresponding codeword W1 in the promised codebook based on the PMI1 and the RI, and terminates the codeword W1 as the channel information.

In step S350, after receiving the corresponding batch signaling, the UE acquires that the quantity x is equal to 2, and the UE feeds back two PMI values and feeds back PMI1, PMI2 and RI to the base station.

W1를 채널 정보로 하고 종료한다.In step S360, the base station receives the PMI1, PMI2 and RI, and then searches for the corresponding codewords W1 and W2 from among the promised codebooks based on the corresponding PMI1, PMI2 and RI, and also W1 × W2 or W2 based on the promised function.

End with W1 as channel information.

Example  6

As a kind of channel information acquisition method, as shown in FIG. 4, the arrangement method mainly includes the following steps.

In step S410, the UE obtains channel information through pilot frequency and channel prediction, and also feeds back rank indicator (RI) information of the current channel to the base station (eNodeB).

In step S420, the base station determines the quantity x of precoding matrix indicator information to be fed back by the UE based on the corresponding RI fed back by the UE and transmits the quantity x to the UE through one batch signaling, wherein x = 1 days When it is moved to step S430, and if x = 2, it moves to step S450, and when x = 3, it moves to step S470.

)를 취득하고,

≥N0일 때 해당 기지국은 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x가 1과 같음을 확정하고 N1≤

<N0일 때 기지국은 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x가 2와 같음을 확정하며,

<N1일 때 해당 기지국은 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x가 3과 같음을 확정하며, 본 실시예 중 바람직하게는 N0은 5와 같고 N1은 3과 같은(기타 어느 한 실시예 중에서 바람직하게는 N1이 2와 같음) 것이다.In one specific application, a base station can determine the rank of the current channel based on its RI.

),

When ≥N0, the base station determines that the quantity x of the precoding matrix indicator information to be fed back to the UE is equal to 1, and N1≤

When <N0, the base station determines that the quantity x of the precoding matrix indicator information to be fed back by the UE is equal to 2.

When <N1, the base station determines that the quantity x of the precoding matrix indicator information to be fed back by the UE is equal to 3, and in this embodiment, preferably N0 is equal to 5 and N1 equals to 3 (any other implementation) In the examples, N1 is equal to 2).

≥N0 정황은 더욱 많이는 SU-MIMO(단일 유저 MIMO)의 정황에 적용되고, 피드백 정밀도에 대한 요구가 높지 않고 UE는 한 개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.

The ≥N0 context is more often applied to the context of SU-MIMO (single user MIMO), and the demand for feedback precision is not high and the UE can select one PMI to feed back channel information.

<N0 정황은 더욱 많이는 MU-MIMO(멀티 유저 MIMO)의 정황에 적용되고, 피드백 정밀도에 대한 요구가 비교적 높고 UE는 2개의 PMI를 선택하여 채널 정보를 피드백할 수 있다.N1≤

The <N0 context is more applied to the context of MU-MIMO (multi-user MIMO), the demand for feedback precision is relatively high and the UE can select two PMIs to feed back channel information.

<N1일 때 피드백 정밀도에 대한 요구가 비교적 높을 뿐만 아니라 N1<=

<N0 정황에 대비하여 채널에 관련된 정보도 활용할 수 있고, 더 나아가서는 피드백 정밀도를 향상할 수 있으므로 3개의 PMI가 필요하며 UE는 3개의 PMI를 선택하여 채널 정보의 피드백을 진행할 수 있다.

When <N1, the demand for feedback precision is relatively high, and N1 <=

In order to prepare for the <N0 context, information related to the channel may also be utilized, and furthermore, since the feedback accuracy may be improved, three PMIs are required, and the UE may select three PMIs to proceed with feedback of the channel information.

In step S430, the UE, after receiving the corresponding batch signaling, acquires that the quantity x is equal to 1, and feeds back the PMI1 and the RI to the base station.

In step S440, after receiving the PMI1 and the RI, the base station searches for a corresponding codeword W1 in the promised codebook based on the PMI1 and the RI, and ends the codeword W1 as channel information.

In step S450, after receiving the corresponding batch signaling, the UE acquires that the quantity x is equal to 2, and feeds back the PMI1, the PMI2, and the RI to the base station.

W1를 채널 정보로 하고 종료한다.In step S460, the base station receives PMI1, PMI2, and RI, searches for corresponding W1 and W2 in the promised codebook based on the corresponding PMI1, PMI2, and RI, and also W1 × W2 or W2 based on the promised function.

End with W1 as channel information.

In step S470, the UE receives the corresponding batch signaling, acquires that the quantity x is equal to 3, and feeds back the PMI1, PMI2, PMI3, and RI to the base station.

(W3’×W3×W1)를 기지국은 UE가 피드백한 RI에 근거하여 UE가 피드백해야 할 프리코딩 매트릭스 지시자정보의 수량 x를 확정하는 것이 아니라, 편파 배치 정보에 근거하여 해당 수량 x를 확정하는 것이다. 본 실시예 중 기지국이 송신단의 이중 편파 배치이고 동시에 수신단이 이중 편파 배치가 아니라고 판단했을 때 m+1개의 PMI를 피드백하고 x=m+1이며 아닌 경우 m개의 PMI를 피드백하고 그 중 수신단의 편파 정보는 UE가 피드백하여 취득할 수 있다.In step S480, the base station receives PMI1, PMI2, PMI3 and RI, and then searches for corresponding codewords W1, W2, and W3 among the promised codebooks based on the corresponding PMI1, PMI2, PMI3 and RI, and also based on the promised function. (W3 '* W3) × W1 × W2 or W2

(W3 '× W3 × W1), the base station determines the quantity x of the precoding matrix indicator information to be fed back to the UE based on the RI fed back by the UE, but determines the quantity x based on the polarization configuration information. will be. In the present embodiment, when the base station determines that the dual polarization arrangement of the transmitting end and the receiving end is not the dual polarization arrangement at the same time, it feeds back m + 1 PMIs, and if it is not x = m + 1, it feeds back m PMIs, of which the polarizations of the receiving end are among them. The information can be obtained by feedback from the UE.

The technical solution of this embodiment can be applied to the context of N1 <= RI <N0 in the above-mentioned Example 6, that is, it can be applied to any other embodiment of the present invention, and some steps thereof can be applied to the above-described Example 6 The same as, and mainly distinguished from the other Example 6 is:

The base station does not determine the quantity x of precoding matrix indicator information to be fed back by the UE based on the RI fed back by the UE. In the present embodiment, when the base station determines that the polarization arrangement of the transmitting end and the receiving end is not the polarization arrangement at the same time, the feedback feedback m + 1 PMI, and if x = m + 1, if not, the feedback P polarization information of the receiver The UE may obtain feedback.

In the above-described embodiment, the base station may transmit the corresponding batch signaling to the UE on the high channel RRC signaling. RRC signaling is defined in LTE and continues to be used in LTE-A. Carrying on high-layer signaling in a channel where some RIs do not change in the long run can reduce the overhead of deployment.

In the above-described embodiment, the base station may transmit the corresponding deployment signaling to the UE on a physical downlink control channel (PDCCH). The PDCCH channel is a downlink control channel defined in the physical layer in LTE, and there is a corresponding physical layer downlink control channel in LTE-A.

If some RIs carry on physical layer signaling in a channel that is prone to change, then the PMI value of the feedback can be well arranged according to the value of the RI.

In the above-described embodiments, when the preferred maximum number of PMIs is 2, the base station arranges the channel information relatively well. When the preferred number of PMIs is 3, the base station performs the arrangement using 1 bit information. When distributing channel information, the disposition is preferably performed using 2 bit information.

Example  8

As a kind of acquisition device for channel information, the device is:

A receiving module, configured to receive a predetermined amount of precoding matrix indicator (PMI) information and rank indicator (RI) information of a current channel transmitted by the terminal;

And an acquisition module connected to the reception module and configured to acquire channel information of subbands based on the predetermined number of PMI information and RI information,

)에 근거하여 PMI 정보의 수량을 확정하고, 해당 RI 정보 중에서

를 지시하며,

는 8보다 크지 않은 양의 정수이다.Among them, the corresponding UE is ranked in the current channel (

And determine the quantity of PMI information based on

To indicate,

Is a positive integer not greater than 8.

The acquisition module is installed to acquire channel information of the subband in the following manner. When the terminal determines the quantity of the PMI information to 1, the codeword W1 is searched in the first codebook based on the PMI1 information and the RI information, and the codeword W1 and the function F of the total n-1 matrices F (W1, W2, Channel information of a subband is obtained based on Wn), or the codeword W1 is represented as channel information of the subband, wherein n-1 matrices are promise values and n is an integer. Alternatively, subband channel information is acquired based on the codeword W1.

Among them, the acquisition module is installed to acquire channel information of the subband in the following manner. When the terminal determines the quantity of the corresponding PMI information to r, the codeword W1 is searched in the first codebook based on the corresponding PMI1 information and the corresponding RI information, and the remaining r-1 PMIs other than the corresponding PMI1 information among the r PMI information. Search for corresponding r-1 matrices in the corresponding codebook based on the information, and channel of the corresponding subband based on the corresponding codeword W1 and the function F (W1, W2, ..., Wn) of the total n-1 matrices. Information is obtained, and among those n-1 matrices, other nr matrices other than the r-1 matrices are promise values, or the function f (W1, W2,...) Of the codeword W1 and the corresponding r-1 matrices. ..., Wn) is used to obtain subband channel information, where r is an integer greater than or equal to two.

Example  9

A device for sorting channel information, which is:

A transmitting module, configured to transmit batch signaling and indicate a quantity of precoding matrix indicator (PMI) information to be fed back to the terminal through corresponding batch signaling;

A receiving module, configured to receive PMI information transmitted by the corresponding terminal and rank indicator (RI) information of the current channel;

An acquisition module connected to the reception module and installed to acquire channel information of a subband based on PMI information and RI information,

among them,

The terminal is installed to determine the corresponding PMI information to be fed back based on the corresponding batch signaling.

Among them, the transmitting module is also installed to determine the quantity of the corresponding PMI information to be fed back by the terminal based on the rank or polarization arrangement information of the channel fed back by the terminal.

Among them, the transmission module is installed to carry the batch signaling on the high-channel RRC signaling or the physical downlink control channel (PDCCH) to transmit to the terminal.

It should be clear to those skilled in the art that each module or procedure of the present invention can be realized using a common computing device and that they can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Preferably, they can be realized through program code that can be executed using a computing device, stored in storage and executed through the computing device, or they can be manufactured separately for each integrated circuit module or they Multiple modules or procedures in a single integrated circuit module are realized. As such, the invention is not limited to any particular combination of hardware and software.

Although the embodiments described above are the same as described above, the above descriptions are merely used to facilitate understanding of the present invention and are not used to limit the present invention. Any technical person in the technical field to which the present invention belongs may make any modifications and changes in form and details that are made without departing from the spirit and scope of the present invention, but the protection scope of the patent of the present invention It should still be based on the scope defined in the appended claims.

 [Industrial applicability]

Compared with the existing technology, the feedback overhead can be effectively utilized because it can provide various kinds of feedback precision and quickly arrange different kinds of feedback according to specific demand.

Claims (16)

The UE acquires rank indicator (RI) information of the current channel with respect to one subband, and the rank of the current channel among the RI information (

), The above

Is a positive integer not greater than 8;
The terminal

Determine the quantity of precoding matrix indicator (PMI) information to be fed back to the base station based on the above, and transmit the quantity of PMI information and the RI information to the base station;
And the base station acquires channel information of the subband based on the quantity of PMI information and the RI information.
And a channel information acquisition method. The method of claim 1,
The terminal

The step of determining the quantity of PMI information to be fed back to the base station based on:

When ≥ N0, the terminal determines the quantity of corresponding PMI information to be fed back to the base station as m;

When <N0, the terminal determines the quantity of the corresponding PMI information to be fed back to the base station as m + 1;
Wherein N0 is an integer greater than 0 and less than or equal to 8, and m is an integer determined based on a degree of feedback precision of the terminal. The method of claim 2,
The terminal

The step of determining the quantity of PMI information to be fed back to the base station based on:

When <N1, the terminal determines the quantity of the corresponding PMI information to be fed back to the base station to m + 2;
And N1 is an integer smaller than N0 and greater than zero. The method of claim 1,
And the PMI information of the quantity includes at least first precoding matrix indicator (PMI1) information. 5. The method of claim 4,
Acquiring, by the base station, channel information of a subband based on the quantity of PMI information and the RI information:
When the quantity of the PMI information is 1, the base station searches for the codeword W1 in the first codebook based on the PMI1 information and the RI information, and the codeword W1 and the function F of the total n-1 matrices F (W1, W2). , ... ..., Wn) or the base station acquires the channel information of the subband, or the base station indicates the codeword W1 as the channel information of the subband, wherein the n-1 matrix is a promise value, n is an integer Or the base station directly acquires channel information of the subband based on the corresponding codeword W1;
When the quantity of the PMI information is r, the base station searches for the codeword W1 in the first codebook based on the PMI1 information and the RI information, and also in the codebook corresponding to the r-1 PMI information other than the PMI1 information. R-1 matrices corresponding to other r-1 PMI information are retrieved, and a function F (W1, W2, ..., Wn) of n-1 matrices including the codeword W1 and the r-1 matrices. The channel information of the subband is obtained based on the above, wherein nr matrices other than the r-1 matrices of the n-1 matrices are promise values, or the corresponding base station is codeword W1 and r-1. Acquiring channel information of the subbands based on a function f (W1, W2, ..., Wr) of two matrices, wherein r is an integer greater than or equal to two. Way. The method of claim 5,
The promise value is a fixed or unchanging vector or matrix, or the rank of the current channel (

) Depends on the promise,

Is a channel information acquisition method characterized by displaying the rank of the channel indicated by the RI information. The method of claim 5,
When r = 2, the function F (W1, W2) is W1 × W2 or W2

Comprises W1;
When r = 3, the function F (W1, W2, W3) is (W3 '* W3) x W1 x W2 or W2

(W3 'x W3 x W1), wherein W3' is a conjugate transpose matrix of W3. As a method of arranging channel information,
The base station transmits batch signaling and indicates a quantity of precoding matrix indicator (PMI) information to be fed back by the terminal through the batch signaling;
The terminal determines PMI information to be fed back to the base station based on the corresponding batch signaling, and feeds back the determined PMI information and rank indicator (RI) information of the current channel to the base station;
The base station acquires channel information of a subband based on the PMI information and RI information.
Method for arranging channel information comprising the. 9. The method of claim 8,
And determining, by the base station, the quantity of PMI information to be fed back by the terminal based on rank or polarization configuration information of the channel fed back by the terminal. 9. The method of claim 8,
During the step of transmitting the batch signaling by the base station, the base station transmits the batch signaling on the high-channel radio resource control (RRC) signaling or the physical downlink control channel (PDCCH) to the corresponding terminal. Placement method. A receiving module, configured to receive precoding matrix indicator (PMI) information and rank indicator (RI) information of a current channel transmitted by the terminal;
An acquisition module, installed to acquire channel information of a subband based on the received PMI information and RI information;
/ RTI &gt;
The quantity of the PMI information is determined by the rank of the current channel in the terminal (

), And from the RI information

Indicating the above

Is a positive integer not greater than 8
A channel information acquisition device, characterized in that. The method of claim 11,
The PMI information includes at least first precoding matrix indicator (PMI1) information,
The acquisition module,
Searching for a codeword W1 in a first codebook based on the PMI1 information and RI information when the quantity of the PMI information is 1;
Acquire channel information of a subband based on the codeword W1 and a function F (W1, W2, ..., Wn) of a total of n-1 matrices, or display the codeword W1 as channel information of the subband. Or to acquire channel information of the subband in a method of acquiring channel information of the subband based on the codeword W1;
And said n-1 matrices are promise values and n is an integer. The method of claim 11,
The PMI information includes at least first precoding matrix indicator (PMI1) information,
The acquisition module,
When the quantity of the PMI information is r, the codeword W1 is searched in the first codebook based on the PMI1 information and the RI information, and the other r among codebooks corresponding to other r-1 pieces of PMI information other than the PMI1 information. Retrieve the r-1 matrices corresponding to one piece of PMI information;
Acquire channel information of subbands based on the function F (W1, W2, ..., Wn) of the n-1 matrix including the codeword W1 and the corresponding r-1 matrices, or the codeword W1 and the subchannel channel information is obtained by obtaining channel information of subbands based on the functions f (W1, W2, ..., Wr) of the r-1 matrix;
Wherein, among the n-1 matrices, nr other matrices other than the r-1 matrices are promise values, and r is an integer greater than or equal to two. Transmits the batch signaling and indicates the quantity of precoding matrix indicator (PMI) information to be fed back by the terminal through the corresponding batch signaling, so that the terminal can determine the PMI information to be fed back based on the corresponding batch signaling A transmitting module;
A receiving module, configured to receive PMI information transmitted by the terminal and rank indicator (RI) information of a current channel;
An acquisition module, arranged to acquire subband channel information based on the received PMI information and RI information;
Device for arranging channel information comprising a. 15. The method of claim 14,
And the transmitting module is further configured to determine the quantity of PMI information to be fed back by the corresponding terminal based on the rank or polarization arrangement information of the channel fed back by the corresponding terminal. 15. The method of claim 14,
And the transmitting module is installed to transmit the deployment signaling to the terminal by carrying the high-channel channel radio resource control (RRC) signaling or the physical downlink control channel (PDCCH).

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